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Fig. 2B —MR images, gross specimen, and photomicrograph of radiofrequency-induced ablation zone day 4 after radiofrequency ablation in distal femur of dog. Sagittal T2-weighted image shows four zones: slightly hyperintense thermally ablated lesion (arrowheads) followed by hypointense band (small arrow), poorly demarcated slightly hypointense peripheral zone, and peripheral hyperintense rim (large arrow).